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https://issues.apache.org/jira/browse/AVRO-1259?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Doug Cutting updated AVRO-1259:
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Resolution: Fixed
Status: Resolved (was: Patch Available)
I committed this.
> improve Trevni encoding of sparse fields
> ----------------------------------------
>
> Key: AVRO-1259
> URL: https://issues.apache.org/jira/browse/AVRO-1259
> Project: Avro
> Issue Type: Improvement
> Components: trevni
> Reporter: Doug Cutting
> Assignee: Doug Cutting
> Fix For: 1.7.5
>
> Attachments: AVRO-1259.patch, AVRO-1259.patch, AVRO-1259.patch
>
>
> If in most records a field is null, Trevni writes a null byte (zero length)
> for that record in that column. This might be optimized by instead using a
> run-length encoding for lengths. The length is signed, so negative lengths
> might be used to indicate the number of zero-lengths before the next non-zero
> value. This could thus be back-compatible.
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